Having gone thru the latest issue of StrateGems, I found two outstanding Proof Games for solving:
G.Donati/O.Heimo, StrateGems 2011
PG in 23.0 moves
[Find a legal game of chess that reaches this position after Black's 23rd move]
S.Hashimto, StrateGems 2011
PG in 25.0 moves
[Find a legal game of chess that reaches this position after Black's 25th move]
2. -c5 N-f5
3. -c6 Nxc6
4. -b4 Nc-d4
5. -b5 -c5
6. -b6 Qxb6
7. -h4 K-d8
8. -h5 K-c7
9. -h6 Qxh6
10. -a4 -b5
11. -a5 -b4
12. -a6 Bxa6
13. -e4 Bxf1
14. -g4 -a5
15. -g5 R-a6
16. -g6 Rxg6
17. -f4 K-b6
18. N-f3 R-g1
19. -e5 -g6
20. -e6 Nxe6
21. -d4 B-g7
22. -d5 R-a8
23. -d6 Nxd6
24. -f5 N-f8
25. -f6 Bxf6